Research on key support technology based on green mining system and its application

The coal gangue by directly discharging and accumulating has seriously destroyed the ecological environment and has been one of big obstacles for coal mines. Based on the green mining theory, the total three influential factors to destruct environment by gangue hill are researched, and a set of technology with gangue backfilling and complicated coal pillar resource mining is put forward. Meanwhile, the corresponding cable truss combined technology for complex roadways is thoroughly analyzed. Under the new support system, the displacement distribution characters of surrounding roadway both in horizontal and vertical direction are simulated by software FLAC3D. After finishing the supporting trial in roadway NO.162403 of Xinsan Mine, the field observation showed that the largest roof subsidence was 166mm and the convergence of two sides was 145mm. In conclusion, the cable truss combined system provides a technical security for the recycle of coal resources and safeguards the backfilling gangue for the next stage.